On 25/03/2007, at 7:09 AM, Daniel Oberhoff wrote:
> Hi,
>
> I am trying to play audio from my sample editor app through an au
> graph which consists of effects and a standard output unit at the end.
> I set a render callback in the head unit of the graph which pulls
> data through a converter. To find the target format for the
> converter I query the head au, but I always get an invalid format,
> or rather it seems the query doesn't fill in anything. The graph is
> updated and initialized at this point (as reported by the relevant
> graph functions). Before I had naively tried to set the input
> format on the au manually as I had done when playing directly to
> the output au, but there I had gotten an error, telling me the unit
> was not initialized.
Maybe the error was telling you that the unit *was* initialised -
with most AUs you can't change their format when they are initialised.
> Now there is no way to ask a unit if it is initialized, but I
> suppose when the graph is updated and initialized the units in it
> will also?
yes - unless they aren't involved in any connections - in that case,
as soon as you connect to or from an AU, it is then initialised.
Bill
>
> Daniel Oberhoff
>
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